/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ranger.services.kafka;

import org.apache.commons.lang.StringUtils;
import org.apache.ranger.plugin.model.RangerPolicy;
import org.apache.ranger.plugin.model.RangerPolicy.RangerPolicyItem;
import org.apache.ranger.plugin.model.RangerPolicy.RangerPolicyItemAccess;
import org.apache.ranger.plugin.model.RangerService;
import org.apache.ranger.plugin.model.RangerServiceDef;
import org.apache.ranger.plugin.service.RangerBaseService;
import org.apache.ranger.plugin.service.ResourceLookupContext;
import org.apache.ranger.services.kafka.client.ServiceKafkaClient;
import org.apache.ranger.services.kafka.client.ServiceKafkaConnectionMgr;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.apache.ranger.plugin.policyengine.RangerPolicyEngine.GROUP_PUBLIC;

public class RangerServiceKafka extends RangerBaseService {
    private static final Logger LOG                  = LoggerFactory.getLogger(RangerServiceKafka.class);
    public static final  String ACCESS_TYPE_DESCRIBE = "describe";

    public RangerServiceKafka() {
        super();
    }

    @Override
    public void init(RangerServiceDef serviceDef, RangerService service) {
        super.init(serviceDef, service);
    }

    @Override
    public Map<String, Object> validateConfig() throws Exception {
        Map<String, Object> ret = new HashMap<>();

        LOG.debug("==> RangerServiceKafka.validateConfig({})", serviceName);

        if (configs != null) {
            try {
                ret = ServiceKafkaConnectionMgr.connectionTest(serviceName, configs);
            } catch (Exception e) {
                LOG.error("<== RangerServiceKafka.validateConfig Error:{}", String.valueOf(e));
                throw e;
            }
        }

        LOG.debug("<== RangerServiceKafka.validateConfig({}): ret={}", serviceName, ret);

        return ret;
    }

    @Override
    public List<String> lookupResource(ResourceLookupContext context) throws Exception {
        List<String> ret = null;

        LOG.debug("==> RangerServiceKafka.lookupResource({})", serviceName);

        if (configs != null) {
            ServiceKafkaClient serviceKafkaClient = ServiceKafkaConnectionMgr.getKafkaClient(serviceName, configs);

            ret = serviceKafkaClient.getResources(context);
        }

        LOG.debug("<== RangerServiceKafka.lookupResource({}): ret={}", serviceName, ret);

        return ret;
    }

    @Override
    public List<RangerPolicy> getDefaultRangerPolicies() throws Exception {
        LOG.debug("==> RangerServiceKafka.getDefaultRangerPolicies() ");

        List<RangerPolicy> ret = super.getDefaultRangerPolicies();
        String authType = getConfig().get(RANGER_AUTH_TYPE, "simple");

        if (StringUtils.equalsIgnoreCase(authType, KERBEROS_TYPE)) {
            LOG.debug("Auth type is " + KERBEROS_TYPE);
        } else {
            LOG.debug("Auth type is {}", authType);
            for (RangerPolicy defaultPolicy : ret) {
                if (defaultPolicy.getName().contains("all")) {
                    for (RangerPolicy.RangerPolicyItem defaultPolicyItem : defaultPolicy.getPolicyItems()) {
                        defaultPolicyItem.addGroup(GROUP_PUBLIC);
                    }
                }
            }
        }

        for (RangerPolicy defaultPolicy : ret) {
            if (defaultPolicy.getName().contains("all") && StringUtils.isNotBlank(lookUpUser)) {
                RangerPolicyItem policyItemForLookupUser = new RangerPolicyItem();
                policyItemForLookupUser.setUsers(Collections.singletonList(lookUpUser));
                policyItemForLookupUser.setAccesses(Collections.singletonList(new RangerPolicyItemAccess(ACCESS_TYPE_DESCRIBE)));
                policyItemForLookupUser.setDelegateAdmin(false);
                defaultPolicy.addPolicyItem(policyItemForLookupUser);
            }
        }

        LOG.debug("<== RangerServiceKafka.getDefaultRangerPolicies() ");
        return ret;
    }
}
